Hello, I am getting this issue of not being able to log on any of the EU servers while i’m logged on my second account that is being played on US server. This issue just appeared after the latest patch. I get the same error as well if I try to connect first on EU and then I get the server incompatible error on US server. I also noticed that whenever I close Bnet app I have to redownload the update.
Another thing I noticed after opening my US account and logging on if I try to log on my EU account at the same time my battlenet will let me know that the game is running and that an update is available. Basically if I log on my EU account while being logged on my US account I am not able to play on the right version of the game on the EU account.